Installing Avast One Free

Avast One Free is an essential security application that safeguards your PC against malicious threats, protects your personal data online, and improves the speed of your PC.

This article explains how to upgrade your Avast Free Antivirus to Avast One Free.

Install and set up Avast One Free

  1. Ensure your Avast Free Antivirus is up to date. To learn more, refer to the article below:
      Updating virus definitions and Avast Antivirus application version
    • Click Find out more on the Avast One Free upgrade notification.
    • Follow the on-screen instructions to install Avast One Free.
    • When installation is complete, complete the four-question survey to personalize your initial Smart Scan. To skip the survey, click Skip all.
    • Click Run personalized scan to start scanning for vulnerabilities on your PC.
    • Follow the on-screen instructions to resolve each found vulnerability. To skip ahead and explore other Avast One Free features, click Skip for now.

    Avast One Free is now installed, but some components may not fully function until you restart your PC.


    If you experience any installation issues:

    1. Ensure your PC meets the minimum system requirements and your Windows version is up to date.
    • Windows 10 except Mobile and IoT Edition (32 or 64-bit); Windows 8/8.1 except RT and Starter Edition (32 or 64-bit); Windows 7 SP2 or higher, any Edition (32 or 64-bit).
    • Windows fully compatible PC with Intel Pentium 4 / AMD Athlon 64 processor or above (must support SSE2 instructions); ARM-based devices are not supported.
    • 1 GB RAM or above.
    • 2 GB free space on the hard disk.
    • Internet connection to download, activate, and maintain program updates and antivirus database.
    • Optimally standard screen resolution no less than 1024 x 768 pixels.
    1. Uninstall any previous antivirus software from your PC. For instructions, refer to the following articles:
    2. Restart your PC, then try to install Avast One Free again by following the steps in this article.

    If the issue persists, contact Avast Support and provide your setup log file. For instructions, refer to the following article:

    Further recommendations

    To learn more about Avast One Free, refer to the following article:

    • Avast One Free 20.x for Windows
    • Microsoft Windows 10 Home / Pro / Enterprise / Education - 32 / 64-bit
    • Microsoft Windows 8.1 / Pro / Enterprise - 32 / 64-bit
    • Microsoft Windows 8 / Pro / Enterprise - 32 / 64-bit
    • Microsoft Windows 7 Home Basic / Home Premium / Professional / Enterprise / Ultimate - Service Pack 2, 32 / 64-bit

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